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  1. KrisBlueNZ

    Transistor As Switch Variation

    I can think of two approaches, neither of them simple. First, you can build an external box that takes the audio from the headphone output of the MP3 player, passes it through a stereo variable gain amplifier, and amplifies it back up to headphone level. The gain of the amplifier would be...
  2. KrisBlueNZ

    Quick Server Move

    I just received an email just then. Did you fix something?
  3. KrisBlueNZ

    Hello everyone !

    Hi Darius and welcome to Electronics Point :-) Your English is fine.
  4. KrisBlueNZ

    Quick Server Move

    I'm not getting any automated emails when new threads are posted in the forums I watch, or when new posts are made in the threads I watch. When I view those forums and threads, they still say "Unwatch forum" and "Unwatch thread" at the top, which means that XenForo still thinks I'm subscribed...
  5. KrisBlueNZ

    Pioneer H-R100 8 track player

    Hi Floyd, Sorry for the delay. I found the service manual but it isn't very helpful. There are only two sections that even show the head, and I've uploaded them below. Click each image to expand it, and right-click and select "Save image as ..." (or something similar) to save it to your hard...
  6. KrisBlueNZ

    Why I haven't been posting too much this weekend.

    I just HAD to Google it. Trust Steve, the pics are pretty disturbing. This is the equipment he used to create the effect, called a Mandoline. I think perhaps these should all be dismantled and destroyed. Info from https://en.wikipedia.org/wiki/Mandoline A mandoline consists of two parallel...
  7. KrisBlueNZ

    Arduino PIC

    I thought so too, but that's not how the specifications are worded. Where is the specification for the maximum protection circuit current? Yes, you're probably right. Current flowing into the protection circuit could cause VDD to rise and this would throw off all of the measurements if VDD is...
  8. KrisBlueNZ

    remote on/off

    Is this your "instrumentation amplifier"? Where is the input? Where is the output? How is the control signal applied to it? Does it work as an instrumentation amplifier in simulation?
  9. KrisBlueNZ

    1979 sanyo receiver blowing fuses

    Hi there and welcome to Electronics Point :-) Yeah, what Dave said. Also, do you have a proper model number? Or is it just called "plus 75"? And can you post a link to the service information you found?
  10. KrisBlueNZ

    Dumb question re. simple inverter

    A lot of the designs I see on the net have problems like that. The people who post them just don't have enough understanding or experience to produce designs that work properly. My pet peeve is instructables.com; most of the electronic projects I've seen have significant problems, and I...
  11. KrisBlueNZ

    Arduino PIC

    I think so, but I strongly advise you to limit the current to a lot less than that - say 5 mA. Remember that that figure is in the absolute maximum limits section of the data sheet and data sheets normally say that the device is not guaranteed to work properly at those limits and that exposing...
  12. KrisBlueNZ

    Arduino PIC

    The Arduino/PIC input WILL draw current if you pull it beyond the power supply rails, because the internal protection diodes will conduct. But as long as you limit this current, the device won't be damaged. The resistance of the voltage divider will inherently limit this current; you just need...
  13. KrisBlueNZ

    Samsung S7275 battery pins layout? To power with powersupply.

    I wouldn't assume that there are only passive components in there. Probably the best way to find out would be to take one apart.
  14. KrisBlueNZ

    3-5 watt audio amp

    Hi Chris and welcome to Electronics Point :-) If you're using a PP3-type 9V battery (the little rectangular ones with the snap-on connector), that isn't a practical power source for an amplifier rated for 3~5W output, or more. The voltage is probably not high enough, but more importantly, PP3...
  15. KrisBlueNZ

    Dumb question re. simple inverter

    When you've removed R1, the 4047 will be able to operate properly. But it's not designed to drive MOSFET gates directly; its maximum output current is only around 10 mA. If you find your MOSFETs are getting hot, it could be because they aren't being switched cleanly, because of the low drive...
  16. KrisBlueNZ

    Designing a Time Delayed Relay

    Yes, you can definitely make it smaller. You can't do much about the clearance requirements for the high-voltage sections, apart from optimising the component positioning, but the low-voltage stuff could definitely be compacted quite a bit. I would be interested to hear your experience with...
  17. KrisBlueNZ

    Designing a Time Delayed Relay

    No, in my experience, you do eventually run out of improvements to make! I agree. It looks better every time. I don't know.
  18. KrisBlueNZ

    PCBweb Software?

    Thanks Dan! I've updated the resource: https://www.electronicspoint.com/resources/list-of-eda-packages.39/
  19. KrisBlueNZ

    Hello, Welcome! (Introduce yourself)

    Hi David and welcome to Electronics Point :-) I saw your question about your Hyperion charger. I found an introductory video at . That's a pretty nice piece of kit. I couldn't find any service information on the web, and I don't have any suggestions yet. I'm keeping an eye on the thread though.
  20. KrisBlueNZ

    PCBweb Software?

    Never mind. I looked at the screen shot (duh!) and it's clearly a separate application. I've updated my EDA packages resource at https://www.electronicspoint.com/resources/list-of-eda-packages.39/ Thanks for the info
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